Machine synchronizing device



Feb. 4, 1947. w. c. WIEKING MACHINE SYNCHRONIZING DEVICE Filed Nov. 18, 1944 4 Sheets-Sheet 1 INVENTOR.

.Ill

Feb. 4, 1947.

w. c. WIEKING MACHINE SYNCHRONIZING DEVICE Filed Nov 18, 1944 4 Sheets-Sheet 2 m6 wx QW A V, AI HI P IHHHHUPMH "A INVENTOR. WK

'w. c. WIEKING MACHINE SYNCHRONIZING DEVICE Feb. 4, 1947.

Filed Nov. 18, 1944 4 Sheets-Sheet 3 T N\\\ I H U H 1 H I WW N H H I 1 U N I 1 H H {I m H I 1 J m H H U U :4 *M/ r I! n a M m a H l m A M 1 I H H w Ev H 1 WW kw MW I INVENTOR.

Feb.4, 1947. I ,,w. 2,415,321

I MACHINE SYNCHRONIZING DEVICE Filed Nov. 18, 1944 4 Sheets-Sheet 4 INVENTOR. Bi! 2 527 52 Patented Feb. 4, 1947 UNITED STATES PATENT OFFICE MACHKNE SYNCHRONIZING DEVICE William C. Wishing, Woodhaven, N. Y., assignor to R. Hoe & (30., Inc., New York, N. Y., a corporation of New York Application November 18, 1944, Serial No. 564,151

(Cl. lob-232) 18 Claims. 1

Ehis invention relates to a combination printing machine and oven drive and more particularly to a drive mechanism and the controls therefor, whereby a printing machine and a device for conveying printed matter to and through a drying oven, may be operated independently by separate driving means or brought into synchronisin and operated simultaneously by the printing machine drive.

In. a drive mechanism of this nature it is desirable that provision be made whereby the printing machine may be operated inde endently for make-ready or for independent printing purposes, and whereby the oven feed may be operated independently to clear the oven after a run is completed, and also that provision be made whereby, upon stopping of the oven feed, the p lng operation will be automatically interrupted and the printing machine driven at a slow idling speed.

To obtain this desiderata it is contemplated as the principal object of the invention to provide mechanical and electrical protective interlocks in the structure of the drive whereby sheets will not be fed to the printing machine nor to the oven until the press feed and the oven feed are in synchronism, that is, until the printing machine feed and the-oven feed are in proper timed relation.

Another object of the invention is to provide in a drive of the above nature, an improved form of synchronizing device whereby the printing machine delivery and the oven feed may be automatically synchronized.

A further object of the invention is to provide in a drive mechanism suitable interlocks in the structure and controls thereof whereby stopping of the printing machine will immediately disconnect the oven drive from the machine drive and cause continued operation of the oven feed, whereby the oven feed cannot be connected to the machine drive unless the sheet conveyors are in proper operable position, and whereby, if the oven feed is stopped, the feeding of sheets to the machine will stop, a device to stop sheets feeding to the oven will be actuated, and the machine will continue running-at a slow idling speed.

It is also an object of the invention to provide a combination printing machine and oven drive of generally improved construction whereby the mechanism will be simple, durable, and relatively inexpensive in construction, as well as convenient, practical, serviceable, and efficient in use.

With the foregoing and other objects in view, which will appear as the description proceeds, the

M invention resides in the combination and arrangement of parts, and in the details of construction hereinafter described and claimed.

The preferred embodiment of the invention is illustrated in the accompanying drawings, wherein:

Figure 1 is a side view of a combination printing machine and oven drive, shown in operative association with a printing machine and oven feed, in which the features and principles of the invention are embodied;

Figure 2 is an enlarged topplan view of the printing machine driving motor and of the synchronizing device between it and the oven drive;

Figure 3 is a sectional view taken on the line 3-4 of Figure 2;

Figure a is a sectional view taken on the line i i of Figure 3;

Figure 5 is an enlarged sectional View taken on the line 5-5 of Figure 2;

' Figure 6 is a sectional View taken on the line 5-5 of Figure 5 with a portion broken away;

Figure 7 is a diagram of the electrical controls for the drive of this invention; and

Figure 8 is a representation of a selector switch.

The machine illustrated in Figure l, is a twocoloroffset printing machine, designed for printing on sheet metal and having plate or form cylinders ii and iii, a blanket cylinder 53 and an impression cylinder i i, which cylinders are operable in the usual manner by suitable gearing (not shown) but connected to a drive shaft it having a chain driven pulley i8 secured thereto. As is usual in prinang machines of this type a cylinder tripping mechanism (not shown) is provided which is actuated to trip the cylinders whenever there isan interuption in the proper feeding of sheets. It will be understood that the machine illustrated is also provided with suitahle means (not shown) for separating the sheets from a pile and feeding hem to the printing cylinders l3 and it. 'his means may include suction devices actuated by solenoids E? which are controlled by a feeder switch i8 and are electrically interlocked with the drive cont ol circuit.

The sheets are conveyed from the printing ma-- chine to a coating machine 69, by conveyor belts 2S and'thence by conveyor belts 25 to an oven conveyor comprising a plurality of wickets 22 attached to an endless chain 0 iveyor 23 by which the printed sheets are carried through a suitable drying oven 2a". The conveyor 23 is driven by achain pul1ey '25 secured on a shaft 2'6 having a bevel gear Z'l in mesh with a bevel 3 gear 28 secured on a vertical shaft 29 which extends downward to a lower floor level, where it is connected to an oven drive unit having suitable earing in a casing 99, and connected to a horizontal motor shaft 9! operated by a motor 32. Th coating machine l9 is driven from the shaft 29 by bevel gears 29a and 2%, a horizontal shaft 29c, bevel gears 29d and 296 and a vertical shaft 29].

The shaft 93 is connected through a chain pulley 95, a chain belt 59 and a chain pulley 35, to a horizontal shaft 35 which extends from the oven drive unit, to a synchronizing device and a printing machine drive unit shown in Figure l and more in detail in Figures 2-6 inclusive. This drive unit (Figure 2) is below the printing machine and comprises a motor 31 having a chain pulley 38 on its shaft 39. The pulley 33 is connected by a chain belt '59 to the chain pulley i6 (Figure l) to drive the press.

Referring now to Figures 2-6 inclusive, the shaft 39, from the oven driving unit, enters a gear box ti, (Figure 2), and is connected to a shaft 92, through bevel gears 43 and i l, secured to shafts 38 and 52 respectively. The shaft 42 extends into a differential gear box 45 and has a gear 29 secured thereto. The gear 99 is in mesh with a gear ring 47 which is secured to and carried by a hub member 48 rotatably mounted upon a shaft (Figures 3 and 4). The shaft 49 extends from the gear box 45 and is secured to one part 55 (Figure 2) of a magnetic clutch, the other part 52 of which is connected to an end 59 of the motor shaft 39. Thus by operation of the motor 9? the press may be driven, and by operation of the motor 92 the oven feed may be driven, each independently of the other, provided the magnetic clutch 52 is deenergized. Also, the oven conveyor may be driven by the press motor 3], by engaging the magnetic clutch parts ill and '52, and deenergizing the oven conveyor motor 92. Before engaging the magnetic clutch, however, it is necessary that the oven and the printing machine be properly synchronized, to insure the arrival of each sheet at the oven, in an instant when a wicket 22 is in position to receive it.

The synchronizing mechanism herein disclosed includes a diiferential gearing (Figures 3 and 4) comprising a pinion 54 secured to the shaft 49, and meshing with pinions 55, 5 and 57 rotatable on the stud shafts 59, 59, and M respectively. The stud shafts 59, 59 and M are carried by and extend from a worm gear 62 which has a hub 63 in which the shaft 39 is journaled. The hub 93 is in turn journaled in a bearing 64 provided in a wall of the gear box 45. The teeth of the pinions 55, 59, and 9'! are also in mesh with internal gear teeth formed on the inner periphery of the gear ring 5?. The outer periphery of the gear body 92 is provided with worm teeth 65 thus providing a worm wheel 59 to mesh with a worm gear 67.

Rotation of the worm gear 97 acting through the differential gearing described will position the shaft 59 in respect to the shaft 36 so that proper delivery of the sheets from the press to the wickets 22 may be accomplished after the magnetic clutch 51, 52 is energized to cause the press motor 3? to drive the oven conveyor. The worm gear 6'! may be rotated, by a timing motor 58 through a shaft 59 to which the gear 51 is secured. The motor 98 is under the control of a timing switch 'il, arranged to be actuated to start and stop the motor 69 by means of a synchronizing detector (Figures 5 and 6) that operates to insure that the machine drive and the oven drive are in proper timed relation. The motor 68 is mounted on a bracket 52 extending from the gear box 95.

The synchronizing detector includes an operating disc l3 (Figure 2) carried by a sleeve 14 which is mounted on a shaft 15 for sliding movement axially thereof. The disc 13 is arranged to have one of its sides contact an operating lever 76 of the timing switch It. The disc 3 is co stantly urged in one direction alon the shaft l5 by a spring Tl coiled about the shaft 15 and reacting between the sleeve is and a collar 18 secured to the shaft 75. A hub member 19 formed integral with the disc is extends therefrom on the side opposite to that engaging the switch lever 79. A disc actuating arm 8i (Figures 5 and 6), which is bifurcated at its free end to straddle the ,shaft 15 and to form fingers 82 and 83 positioned to engage the end of the hub member i9, is pivoted by a pin 89 in and between brackets 85 and 89. The brackets 85 and 86 are secured to, and thus carried by, a disc 8'! which is secured to the shaft 75 by a set screw 89. A stud 89 extends from the arm 9! through an opening 9! provided in the disc 81 and has a rollor 92 mounted upon its outer end. The roller 92 is arranged to ride upon the inner periphery of an enlarged circular opening 93 provided in a circular plate 94. At one point in the periphery of the opening 93 an arcuate depression 95 is formed, into which the roller 92 will drop when it is opposite the depression 95, due to relative rotation of the disc 81 and the plate 94. The rolle 92 dropping into the depression 95 allows the arm 8! to swing on its pivot pin 84 whereby the hub I9 and the disc F3 under the urge of the spring TI, will move along the shaft 15 and allow the timing switch H to operate, first to stop the motor 69 and then to close a circuit energizing sheet feeding control devices as hereinafter disclosed.

The plate 95 is provided with a peripheral flange 98 which overlaps the periphery of a disc 91 and is adjustably secured thereto by washers 98 overlapping the outer edge of the disc 97 and held by means of screws 99, thus clamping the disc 97 to an annular shoulder I 0| provided on the flange 95. The disc 91 is provided with a hub I92 which is secured to a shaft I93 by a set screw I 9d. The disc 9'! is recessed at I95 to receive an end of the shaft I5 in a ball bearing I06 mounted in the recess I95. Annular adjustment of the plate flange 99 upon the disc 91 permits the positionin of the depression 95 in respect to the roller 92 to time the action of the disc I3 upon the switch lever I6 in respect to the relative rotation of the shafts 15 and I03.

The shaft 15 is connected by a coupling I 01 (Figure 2) to a stud shaft I08 extending from a reduction gear housing I99, the gears therein (not shown) being driven from a sprocket wheel II I which in turn is driven from a sprocket wheel II2 by a chain H3. The sprocket wheel H2 is secured upon an end H4 of the shaft 42 which extends beyond the gear box 45. The shaft I93 extends into a reduction gear housing N5 the gears therein (not shown) being driven by a sprocket wheel H5 which in turn is driven from a sprocket wheel I I! by a chain I I8, the sprocket wheel III being secured to the extended end 53 of the press motor shaft 39. A pulley II connected to and rotatable with the sprocket wheel III, is drivingly connected to a pulley I26 by a belt I21. The pulley I29 is connected to a centrifugal switch I22 (Figure 7) disposed in a housing I 23 and connected in a control circuit for the magnetic clutch El, 52. A similar centrifugal switch I24 (Figure 7), disposed in a housing I25 is'connected to a pulley I25 which is drivingly connected to a pulley 412i by a belt 128. The pulley E21 is drivingly connected to the sprocket l Iii. The centrifugal switch I24 in the housing I25 is in the aforementioned magnetic clutch control circuit and is in series with the centrifugal switch I22 in the housing I23 (Figure 7).

The sheet conveyor belts 2:? may be swung upward to give access to the center i 9. Such movement operates a double throw conveyor switch l I29 (Figures 1 and 7), which prevents coupling the press drive to the oven conveyor drive, and permits hand feeding of sheets to the coating machine and forwarding them to the oven, and also permits operation of the printing machine separately to print and stack sheets that do not require baking. A sheet stopping device l3I also is provided and is located adjacent the ccater I 9. Preferably the device Ifil comprises a plurality of fingers which are arranged to be swung upwardly into the path of the sheets by a spring and to be drawn downward to the position in Figure l by means of a solenoid I32 (Figure 7).

From the foregoing paragraphs it will be understood that the printing machine and the oven conveyor have individual motors, and a three element difierential gear mechanism (Figures 3 and 4) is provided having driving connections to the printing machine motor Bl, to the oven conveyor motor 32, and to the timing motor clutch SP-52 is interposed between the motor 37 and the differential gear mechanism, so when the clutch is disengaged, one of the differential driving connections is broken, and the printing machine and the oven conveyor can be operated separately. In the usual operation of the equipment the machine and the conveyor are started separately and when ready to print sheets, the clutch is engaged coupling them together. Simultaneously the electrical connections to the motor 32 are broken and the printing machine, and the oven conveyor are both driven by the motor 31. The timing motor 58 operating through the differential gear then automatically brings the conveyor into proper timed relation with the machine and the timing motor is then stopped. At this time the sheet feeding mechanism is actuated and printing starts. Whenever the printing machine is stopped the clutch is disengaged and the motor 32 is energized to continue the operation of the oven so that the sheets then in the oven will remain there only the normal length of time, as is necessary to avoid spoilage. Should the oven motor be stopped while the printin machine is running, the latter will continue to run at slow speed, but the sheet feeding mechanism will stop feeding the sheets. The centrifugal switches I22 and I2 2 which are connected to the oven drive and the printin machine respectively and are closed only while they are running, insure that both the printing machine and the oven drive are running before the clutch is engaged. These and other electrical interlocks which are provided, prevent improper use of the equipment, as will be understood by those versed in the art.

Figure 7 shows an electrical circuit diagram with control switches in position to synchronize the oven drive and the machine drive and to operate both the printing machine and the oven The to print sheets and carry them through the oven. To operate the machine a six pole double throw manually operated selector shown in Figure 8, and having switches I33, 34, I35, E35, 33? and F553 is thrown to the right; a position in which the switches i553, I3 3, I35, and i313 are closed and the switch it? is open. The oven drive may now be started by closing the run button switch tail and momentarily pressing the start button, which closes the contacts I l? and thereby energizes the coil of a relay l through a circuit ex tending from the line L2 through the run switch Hi9, closed contacts Idii of relay I59, contacts 54'] closed momentarily by the opening of switch I4! coil of relay I42, and to the line LI. Contacts II -3 (now closed), bridge the contacts I-i'l and maintain the coil of relay I 12 energized. Energizing the relay I22 also closes the contacts [M and energizes a coil Hi5 of the oven drive motor controller starting the motor and driving the chain 23 carrying the wickets 22.

The printing machin drive motor 3i may now be started by operating a start button MS of the printing machine control. This momentarily en-- ergizes the coil of a relay Hi9 by a circuit from line L2 through normally closed contacts 55! of a stop button, thence through contacts i i-8, and coil I til, to the line LI. Energizing the coil of relay E closes contacts 52 to energize the coil of a relay tilt by a circuit from line wire L2 through the contacts Nil, 252, and coil of relay 5% to the line LI. The coil of relay IE3 is maintained energized by the closing of its contacts i5 3 to close a circuit from line L2 through contacts ltll, ifi i, coil of relay I53 to the line Li. The operation of the start button 55-3 also energizes the control circuit of a suitable printing machine motor controller I235. Contacts I55 which are closed by the closing of the oven conveyor run switch 38, are in parallel with the contacts of switch H which is in its open position as shown, whenever the printing ma hine and oven conveyor are to be operated in synchronism. The two switches I55 and E56 are in parallel, and in series with the press drive slowfast switch Eel. When both switches and itt are open the press will run at a slow idling speed with the oven conveyor disconnected from the press and no sheets being fed. With switch I closed and the press drive slow-fast switch I 5'5 open, the same idling speed is obtainable with the oven connected to the press and sheets being fed.

Momentary energization of the coil of the relay Md also closes contacts I58 whereby a circuit from line wire L2 through run button switch I33, through normally closed contacts of the start switch 5 35, switch E33, contacts I58, switch I the coil of a relay I59, to the line wire Li. The momentary energization of the coil of relay i553, closes its contacts MI to maintain it through a circuit leading from line L2 through switch 539, contacts E li and I52 (then closed), contacts ifii, switch i3 1, coil of relay IE9 to line LI. The coil of a time-delay relay E33 is in parallel with the coil of the relay I 5d and is therefore energized and maintained therewith.

Simultaneously with the closing of the maintaining contacts til, the contacts i 35 are opened and deenergize the coil of relay 5412, opening the oven drive contacts Id l and deenergizing the coil- MB of the controller for the oven motor 32. The motor will continue to run for some time at sufficient speed, however, to maintain closed the centrifugal switch I 22, which is driven by it. At

the same time other normally closed contacts the on the relay I59 are opened and contacts I66 on the time delay relay IE3 are closed.

Before the speed of the oven drive has been reduced sufficiently to open the centrifugal switch I 22, the machine drive has attained suificient speed to close its associated centrifugal switch 524. With the conveyor belts 26, in position to convey sheets from the machine to the coater I9 and thence to the oven, the contacts I51 of the conveyor switch I28 are closed, hence closing of the contacts I55 of relay I 59, completes a circuit from the line wire L2 through the run switch I39, contacts MI, I62, NH, and I65, centriiugal switches I22 and I24, conveyor switch contacts I51, and through a switch I35 to energize the coil of a relay I68 connected to the line LI.

Energizing the coil of the relay I68 closes contacts I59 which complete a circuit from a direct current line DCI through the coil of a relay II! to a direct current line DC2. Energizing the relay I II closes contacts I12 and energizes the magnetic clutch E, 52 from the line DCI and DC2, connecting the oven drive to the machine drive, both of which are then driven by the motor 3?. Contacts I73 of the relay it are also closed and complete a circuit from line L2 through the timing switch II, to a contactor coil I'I l controlling the timing motor 68, and to the line LI thereby starting the timing motor. When the machine feed and the wickets 22 are brought into synchronism by operation of the motor =88 and the differential gearing, and this condition is detected by the synchronizing detector, as hereinbefore described, the timing switch II is actuated to open the circuit to the contactor coil I14! and stop the motor 68. The timing switch II when so actuated closes a circuit from the line wire L2 through normally open contacts I13, now closed by the relay I 68, to a normally closed contact IIB, controlled by the relay I42, to a switch ISii, through the coil of a relay IT! to the line wire LI. Energization of the relay II'I closes contacts I13 and I19 which control the sheet feeding control solenoid l7 and the sheet stopping control solenoid I32 respectively. Sheets may now be fed into the machine, printed thereon, passed through the coater I9 and conveyed to the wickets 22, which wickets are running in synchronism with the machine.

The equipment is ordinarily controlled by two operators, one for the printing machine and one for the oven conveyor, and the control arrangement is such that neither can stop the portion of the equipment controlled by the other operator.

To stop the printing machine without stopping the oven drive while they are running together, the push-button I5I is operated and stops the feeder and the printing machine, by opening the maintaining circuit to the relay I53, deenergiz ing the time delay relay I63, the relay I59, and the relay use. Deenergizing the relay I68 opens the magnetic clutch contacts I 69, disconnecting the oven drive from the machine drive; and the circuit to the relay IT! is opened, thereby deenergizing the solenoids i1 and I32, stopping the feeding of sheets, and allowing the fingers of the stopping device I3I to raise and prevent any sheets that may be on the belts 2| from reaching the oven. When the relay I59 is deenergized contacts Hit and I 34 close. The contacts IE6 of the time delay relay I53 remain closed for a short time after it is deenergized to insure energizing the relay M2, which will be maintained by the closing of contacts I43, and the contactor coil I45 of the oven drive motor 32 will be energized by the closing of the contacts lit. Continuance of oven drive operation after the printing machine is stopped, clears the oven of sheets.

To stop the oven conveyor drive while the printing machine and oven drives are running together, the oven drive push-button switch I39 is operated. This stops the oven conveyor and the sheet feeder, but the cylinders of the printing machine will continue to rotate. Opening the switch I39 opens all circuits controlling the oven drive, the relay I 32, the oven controller contactor M5, the time delay relay Hi3, the relay I59, the relay 168, the magnetic clutch relay III, the relay Ill, the sheet feeder solenoid I7, and the sheet stop solenoid I32, none of which can again be energized until the switch I39 is closed. The contacts I56 that are opened simultaneously with those of the switch I39 are in the slow-fast circuit of the machine drive motor which is thus decelerated to slow speed. Simultaneous with the stopping of the oven, the switch IZiI opens, thereby deenergizing a slow down relay 82 which inserts a light load resistance into the circuit of the motor driving the printing machine. At all times the relay I82 is energized, its contacts short out this resistance so the machine will not stall while driving the oven,

When it is desired to run the press and oven drives independently of each other, the six pole selector switch is thrown to the left, so the contacts at poles I33, I34, !35, I36 and I38 are open and the contact at pole I3? is closed. The conveyor belts 20 bein raised, the contacts I85 of the conveyor switch I29 are closed. These contacts E84 are in series with the switch I3? (now closed), whereby a feeder switch I85, when closed, will cause the relay IT! to be energized to close contacts I18 and I79 and energize the feeder solenoid I7 and the sheet stopping control solenoid I32.

To operate the printing machine alone, the switch i86 is closed. The printing machine may now be started by momentarily pressing the start button I 48.

The oven conveyor may be operated separately by closing the run button switch I39 and momentarily closing the start button I lI to close contacts I ll. Closing of the contacts I l? energizes the relay M2 to close the relay maintaining contact H33 and the contacts MG to energize the control coil Hi5 of the oven drive motor 32. As the selector switches I33 and I34 are open, the relays I5 and I53 cannot be energized.

The contacts H52 provide an interlock between th machine drive controls, the oven drive controls and the synchronizing mechanism whereby is machine motor 31 must be in operation before the oven drive can be connected to it. The timing switch 7! also forms an interlock whereby the machine feed and the wickets 22 must be in synchronisln before sheets can be fed. The contacts I62 also provide an interlock whereby, should the machine be stopped, the oven drive will immediately be disconnected from the press drive and operate independently to clear sheets from the oven. The conveyor switch I29 provides an interlock whereby the conveyor must be in proper sheet conveying position before the oven drive can be connected to the press drive. The switch 'II also forms an interlock to prevent sheets being fed to the press and to the oven if the oven feed is stopped or if the oven and machine get out of synchronism.

tre a and essential attributes thereof, and it t er fore desired that the present embodito indicate the scope of the invention.

What I claim is:

1. In a combined printing machine and oven conveyor drive, a motor having a driving connection with the machine, a motor having a driv ing connection with the conveyor, means to con-- nect the machine and the conveyor together, to

operate both of them by one motor and including differential gearing operably connected to one of the dliVil g connections and an electrically operated clutch ior onerably connecting the difierential gearing tot ..t'her driving connection, and means actuated only when both the machine and the conveyor are to engage the clutch and operahly connect the nrii C021l1 3- tions together and dcenergize themc'tor of one driving connection.

2. In a combined printing machine oven onveyor drive, a first rector for driving the press, a second motor for dri g the conveyor, mechanism to connect the motors together for opera of both the machine and the conveyor by motor and including differential. gearing conto one of t e motors and a me for connecting the erential c or, a third motor to o:

to thereby synchronize a a synchron.

he motor when the reach chronisrn.

.0 stop that motor l conveyor in s 3. In a combined prim e oven conveyor drive. a first motor d ing the chine, a second motor for driving the conveyor, mechanism to connect the motors together for operation of both tli machine the conveyor hy one motor and including diff rential gear ng connected to one or" the motors a d a mas.v clut h for connectin the gearing to the other motor t-- motor to o te the diiierential ge to ierehv'synch iize the conveyor and he machine, at richronizing conveyor are operating, to ener ize the magnetic clutch and connect th gear with the motor and to deenergize the second motor.

A combined printing machine and oven conveyor drive comprising a motor to drive the machin to the machine, means to control the forwarding of sheets from the machine to the conveyor, a second motor for driving the conveyor, means including an electrically operated clutch to connect'the first and second motors together for the combined operation of the machine and the corn veyor by the first motor, means to engage the clutch only when both motors are running, means to synchronize the press the conveyor, a syn-- chronizing detector, and a control means actuated by the detector when synchronization ere ists, to permit feeding sheets to the machine forwarding them to the conveyor.

5. A combined printing machine and oven con-- veyor drive comprising a first motor to drive the means to control the feeding of sheets machine, means to control the feeding of sheets to the machine, means to control the forwarding of sheets from the machine to the conveyor, a

energize the magnetic clutch, and to d the second motor.

6. A combined printing machine and oven conveyor drive in accordance with claim 5 and in which a control is provided in the first motor circuit and is operative to deenergize the magnetic clutch and energize the second. motor when the first motor is stopped.

7. A combined printing machine and oven conveyor drive in accordance with claim 5 and having a control circuit for the clutch, ineluding a centrifugal switch that is closed when the machine is in operation and another cen triiugal switch that is closed when the conveyor is in operation, both of which must he closed fore the magnetic clutch can be ener ized.

8. A combined sheet printing machine and oven conveyor drive comprising motor to rive e machine, means to control the feedin of .s to the machine, means to control the rorwar'" g of sheets from the machine to the conveyor, another motor for driving the conveyor, connect the machine to the conveyor and including a differential gearing connected to one of the motors and a clutch connected to the other inotor, a third motor to operate the di ing to synchronize the mac. .ne and a synchronizing detector device the third motor and arranged to doe motor when synchronization is acco- 9. A combined printing machine and oven con-- veyor drive in accordance with cl. which the detector device actii switch adage to a circuit to the ti motor to stop it and to clos. circuits the ir to control the feeding of sheets to the machine and the means to ccntr l the forward from the machine the c nve machine and the conveyor 10. A. combined prin he machine and oven dr ve in accordance with claim 8 which he detector device is arranged to actuate a timing switch to stop the ird motor to close circuits to the sheet feeding control means and the sheet icrwar means only when the conveyor is o sy -c-.ronism the machine.

ntlal gear-- of sheets c ntrol g in A combined pri ng machine and oven conveyor d1 've corn ng motor to drive the 's to control the feeding sheets ans to control the forwardc conveys or, mechasynchronize conveyor, a synchronizing ector device in control of the third motor and arranged to deenergize that motor when synchronization is accomplished, and means actuated only when both the machine and the conveyor are running, to engage the clutch and to deenergize the second motor.

12. A combined printing machine and oven tial 11 conveyor drive in accordance with claim 11 and in which a control is provided in the machine driving motor circuit that is operable to release the clutch and to energize the conveyor motor when the machine driving motor is stopped, the detector device being arranged to actuate a switch to stop the third motor and to close circuits to the means to control the feeding of sheets to the machine and the means to control the forwarding of sheets from the machine to the conveyor, only when the machine and the conveyor are in synchronism.

13. A combined printing machine and oven conveyor drive in accordance with claim 11 and in which a control is provided interlocking the circuits of the first mentioned and second mentioned motors, to insure that the second mentioned motor is driving the conveyor before the first motor can be started.

14. A combined printing machine and oven conveyor drive comprising a motor to drive the machine, means to control the feeding of sheets to the machine, means to control the forwarding of sheets from the machine to the conveyor, another motor for driving the conveyor, mechanism to connect the machine to the conveyor and including a differential gearing connected to one of the motors and an electrically operated clutch connecting the gearing to the other motor, a third motor to operate the differential gearing to synchronize the machine and the conveyor, a synchronizing detector device in control of the third motor and a'ranged to deenergize that motor when synchronization is accomplished, and a control device controlled by the detector device to energize the means to control the feeding of sheets to the machine and the means to control the forwarding of sheets from the machine to the conveyor when synchronization is accomplished.

15. A combined printing machine and conveyor drive comprising a motor to drive the machine, means to controlthe feeding of sheets to the machine, means to control the forwarding of sheets from the machine to the conveyor, another motor for driving the conveyor, mechanism to connect the machine to the conveyor and including a diiferential gearin connected to one of the motors and an electrically operated clutch for connecting the gearing to the other motor, a third motor to operate the differential gearing to synchronize the machine and the conveyor, a synchronizing detector device in control of the third motor and arranged to deenergize that motor when synchronization is accomplished, a control device controlled by the detector device to energize the means to control the feeding of sheets to the machine and the means to control the forwarding of sheets from the machine to the conveyor when synchronization is accomplished, and means actuated only when the machine and the conveyor are running to engage the clutch and to deenergize the conveyor motor.

15. A combined printin machine and. oven conveyor drive comprising a motor to drive the machine, means to control the feeding of sheets to the machine, sheet forwarding means to carry sheets from the machine to the conveyor, another motor for driving the conveyor, mechanism to connect the machine to the conveyor and including a differential gearing connected to one of the motors and a magnetic clutch for connecting the gearing to the other motor, a third motor to operate the differential gearing to synchronize the machine and the conveyor, a synchronizing detector device in control of the third motor and arranged to deenergize that motor when synchronization is accomplished, a control device controlled by the detector device to energize the means to control the feeding of sheets to the machine and the means to control the forwarding of sheets from the machine to the conveyor when the synchronization is accomplished, and means actuated only when the machine and the conveyor are running to energize the magnetic clutch and to deenerg ze the second motor, and control means actuated by the positioning of the conveyor in proper timed relation to the machine, to maintain the mag etic clutch and t e sheet feeding controls energized.

1'7. In a dr ving mechanism for a printin machine with which an oven having a conveyor is associated, a first driving motor connected to the machine, a second driving motor connected to the conveyor, an adjustable coupling mechanism connected to one of the motors and having a clutch arranged to connect the coupling mechanism to the other motor, a synchronizing motor connected to the coupling mechanism, a synchronizing device having one member rotating in timed relation with the machine and another member rotating in timed relation with the con veyor, and means actuated when both of the said members are in synchronism, to effect engagement of the clutch.

18. In a driving mechanism for a printing machine with which an oven having a conveyor is associated, a first driving motor connected to the machine, a second driving motor connected to the conveyor, an adjustable coupling mechanism including differential gearing having a first connection for driving it by the first motor, and a second connection to drive the conveyor, a synchronizing motor connected to a third connection of the differential gearing and operable to adjust the coupling mechanism, a synchronizing device having one member rotating in timed relation with the machine and another member rotating in timed relation with the conveyor, and means actuated when both of the said members are in synchronism to stop the synchronizing motor.

WILLIAM C. WIE-KING.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,993,579 Wright Mar. 5, 1935 1,157,740 Walser, et al Oct. 26, 1915 2,378,444 Smith, et a1 June 19, 1945 1,924,625 Roesen Aug, 29, 1933 

